diff --git a/specs/core/0_beacon-chain.md b/specs/core/0_beacon-chain.md
index 5ab3da052..454cf105b 100644
--- a/specs/core/0_beacon-chain.md
+++ b/specs/core/0_beacon-chain.md
@@ -1528,7 +1528,7 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
         validator_registry_update_epoch=GENESIS_EPOCH,
 
         # Randomness and committees
-        latest_randao_mixes=[ZERO_HASH for _ in range(LATEST_RANDAO_MIXES_LENGTH)],
+        latest_randao_mixes=Vector([ZERO_HASH for _ in range(LATEST_RANDAO_MIXES_LENGTH)]),
         previous_shuffling_start_shard=GENESIS_START_SHARD,
         current_shuffling_start_shard=GENESIS_START_SHARD,
         previous_shuffling_epoch=GENESIS_EPOCH,
@@ -1548,11 +1548,11 @@ def get_genesis_beacon_state(genesis_validator_deposits: List[Deposit],
         finalized_root=ZERO_HASH,
 
         # Recent state
-        latest_crosslinks=[Crosslink(epoch=GENESIS_EPOCH, crosslink_data_root=ZERO_HASH) for _ in range(SHARD_COUNT)],
-        latest_block_roots=[ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)],
-        latest_state_roots=[ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)],
-        latest_active_index_roots=[ZERO_HASH for _ in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH)],
-        latest_slashed_balances=[0 for _ in range(LATEST_SLASHED_EXIT_LENGTH)],
+        latest_crosslinks=Vector([Crosslink(epoch=GENESIS_EPOCH, crosslink_data_root=ZERO_HASH) for _ in range(SHARD_COUNT)]),
+        latest_block_roots=Vector([ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)]),
+        latest_state_roots=Vector([ZERO_HASH for _ in range(SLOTS_PER_HISTORICAL_ROOT)]),
+        latest_active_index_roots=Vector([ZERO_HASH for _ in range(LATEST_ACTIVE_INDEX_ROOTS_LENGTH)]),
+        latest_slashed_balances=Vector([0 for _ in range(LATEST_SLASHED_EXIT_LENGTH)]),
         latest_block_header=get_temporary_block_header(get_empty_block()),
         historical_roots=[],